问题
选择题
All their attempts to rescue the child from the burning building were _____, and he died soon.
A．in place
B．in return
C．in vain
D．in ruins
答案
答案：C
题目分析：A. in place在适当的位置，B. in return做为回报，C. in vain徒劳，D. in ruins成为废墟，句意：所有的救援着火的房子里面孩子的努力都徒劳，他很快就死了。根据句意选C。